Stock G450X in 40hp trim with standard 15t front sprocket felt like a slightly overgeared 400EXC. Throttle response was good.
Stock gearing with full power (plug & Akra) transformed the bike, throttle response was incredibly sharp. Gearing was no longer an issue, it romped up the steep hill at the Offroad School where you practice hill recovery.
Full power & 13t sprocket was an animal, very easy to tie yourself in a knot.
The Akra really sharpens up the throttle response as the Cat's removed, a nice combo for trailriding would be a 14t sprocket, 40hp & the Akra. I found the 40hp bike with standard silencer very easy easy to ride in thick mud etc.
Suspension was very compliant & seems to be set up a little like an EXC i.e. set up for someone weighing 85-90kg wearing all their riding gear. Obviously rear preload can be adjusted but much heavier & you'll need a stronger spring.